wxDbConnectInf is now converted to a class. Fully backward compatible with all versi...

wxDbConnectInf is now converted to a class.  Fully backward compatible with all version except the last checkin I did (changed datatypes back to what they were before for in this class).  Class now has all accessors and member functions.  Functions added to remove need for calling SQLAllocEnv() and SQLFreeEnv().
General gcc changes in the Printf() statement when using wxStrings as params to Printf()
General code clean up, correcting comments, added more comments

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9273 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775